Just an update, and because I read forums too and part numbers help.
Removed the locker and installed a factory limited slip carrier, and rebuilt with ford part # 6L1Z-4947-B, oem clutch set mustang1999-2014
Stacked factory style, 1994 ranger carrier and s spring, royal purple fluid, no additive, clutches soaked 1/2 hour.
Truck drives like a dream now. Smooth, positive bite when I need or want it, no jerking. Truck rides and drives beautifully.
A lunchbox locker on asphalt is f*cking horrible. IDGAF what anyone tells you, don't do it. It f*cking eats your tires and sucks to drive. Oh, and it ate two more tires before it left. A**hole locker...
i will NEVER repeat this mistake.
That said, I have a powertrax 1820-LR for sale, 6000 miles on it.